1677661640 has 16 divisors (see below), whose sum is σ = 3774738780. Its totient is φ = 671064640.

The previous prime is 1677661621. The next prime is 1677661649. The reversal of 1677661640 is 461667761.

It can be written as a sum of positive squares in 2 ways, for example, as 1594085476 + 83576164 = 39926^2 + 9142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1677661591 and 1677661600.

It is not an unprimeable number, because it can be changed into a prime (1677661649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20970731 + ... + 20970810.

Almost surely, 2^1677661640 is an apocalyptic number.

1677661640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1677661640 is an abundant number, since it is smaller than the sum of its proper divisors (2097077140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1677661640 is a wasteful number, since it uses less digits than its factorization.

1677661640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41941552 (or 41941548 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 1677661640 is about 40959.2680598665. The cubic root of 1677661640 is about 1188.2325856746.

The spelling of 1677661640 in words is "one billion, six hundred seventy-seven million, six hundred sixty-one thousand, six hundred forty".